you are asking for a magic pill to clear all your doubts ! nobody can give that, but everyone is looking for it.
you heard it right, not just 5-6, there are cases running for 10 years.
if you assume winning RCR will make you eligible for divorce, idont think it is guaranteed. if she contests your case (rcr or divorce or any), it means cases get dragged. if you have strong evidences - where she physically assaulted you and you have proof, is mentally sick, is having a physical affair or as @hh mentioned filed false cases etc., it becomes fast.
Behaviour cruelty is difficult to prove unless there is material evidence.
Your best bet would be NO COHABITATION between husband and wife for more than 2 years, there need not be a bigger reason for divorce. First desertion and its cruel effect, second other acts of cruelty by her.
so relax, sit back, read about various divorce cases on the internet and when you get the indian family court picture, you will be suggesting steps for others :)
your only action should be to try and convince her to come back (by email/letter etc. keep proof of your attempts to reconcile), when you have the proof, you stop trying and wait for 2 years to complete.